The only things worth worrying over right now would be a good charger with removable cable. A good cable or 2, perhaps in different lengths. 1TB Micro SD card. Case to keep it clean and safe. A portable power bank which can deliver the required 45W output. Aside from that you may want to consider a kickstand if you intend to use it in a way that is conducive with such an accessory. I have a few recommendations if you'd like to browse the deals I've found
SD Card -Lexar Play 1TB card, $136 on amazon right now. Appears to be their cheapest 1TB A2 offering from a legitimate company https://smile.amazon.com/Lexar-Compatible-Nintendo-Switch-Smartphones-LMSPLAY001T-BNNNU/dp/B08T8LL7G8/ref=sr_1_3?crid=1CZFNUUGV2ABL&keywords=1tb+micro+sd+card&qid=1657492814&sprefix=%2Caps%2C116&sr=8-3
Case - there are quite a few options already so take your pick but I couldnt stand the over the top appearance of most so I got one of those cheap clear plastic ones for $8 off amazon to hopefully last at least until the Killswitch gets launched
Kickstand - ESR kickstand has been tested and confirmed functional by other users here and its fairly affordable at $11 from Amazon. Part of the reason to have a case is so you dont have to worry about sticking stuff like this or NVME expansions to the Deck directly. https://smile.amazon.com/gp/product/B08FB5GWZZ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Power Bank - This power bank from apoapo is only $30 after coupon code and I have confirmed it will output the necessary wattage to charge a Deck https://smile.amazon.com/gp/product/B09MF1RM9X/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Charger - I have a few recommendations here. This is a go-to option in my opinion. It gives plenty of power but also allows you to charge up to 2 other devices simultaneously. Downside is that it is a bit bulkier. For $26 right now it is the best deal I found so far https://smile.amazon.com/Charger-TECKNET-Foldable-Adapter-Compatible/dp/B08YJLMQGD/ref=sr\_1\_8?crid=274IWDDBDA00M&keywords=gan+charger+45w&qid=1657496234&sprefix=gan+charger+45w%2Caps%2C250&sr=8-8 This option is much smaller but only charges 1 device despite costing $14 more https://smile.amazon.com/Charger-Anker-Adapter-Supported-Foldable/dp/B08T5QVTKW/ref=sr_1_1?crid=1NPL8CRCVQSW2&keywords=gan+charger+45w&qid=1657492960&sprefix=gan+charger+45w%2Caps%2C125&sr=8-1 This Baseus option is for you if you're really trying to get as much utility out of the fewest devices possible, it combines the charger with the power bank with either 2 USB C ports or 1 type C and 1 type A port. The downside is it only charges at 30W from the battery but it will provide 45W from the wall. Also it appears to only be available in white on amazon but there are other retailers that still have the black models in stock https://smile.amazon.com/gp/product/B08D9M1Q6C/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
As far as cords go I'd get ones rated for 100W just in case. Some manufacturers love to over rate their products and you may legitimately need 100W USB C cords now or in the future. You can also get them with a display built in which shows how many watts are being pulled through the cord.
Anker Nano II 45W.
https://smile.amazon.com/dp/B08T5QVTKW/ref=cm_sw_r_apan_glt_fabc_354RVG8TGDXAVAZYCHD9
If you want to save a little money, you could go for the 30W, which doesn't have folding prongs.
Just ordered this and it's really tiny. Haven't tried it out yet.
I went with the Anker Nano II.
It's currently sitting at $40 but I managed to get it for $27 back in November. It's 45W and besides my P6P, it charges my Tab S7+ at full speed too.
anker 45W is really expensive at $39.99 & anker 65 also. There are more powerful 20V-3A-65W chargers that heat a lot faster and cost a lot less.
Many Usb-C on Pinecil wiki list cost less and give more power than anker 45w
I just received all of these today, tested them all, and all show super fast charging on my S21 Ultra, I expect the same from the S22U since they're 45w.
MANINAM Super Fast USB C Car Charger for Samsung S21 S20 Ultra Note 20 10 Plus Super Fast Charging 2.0
Anker New Nylon USB C to USB C Cable (6ft 60W, 2-Pack)
Anker USB C Charger, 713 Charger (Nano II 45W)
I bought the Anker nano 2 45w it supports super fast charging solid charger and I highly recommend it.
Anker USB C Charger, 713 Charger (Nano II 45W), GaN II PPS Fast Compact Foldable Charger for MacBook Pro 13, Galaxy S22/S22+/S22 Ultra/S21, Note 20/10, iPhone 13/Pro/Pro Max, iPad Pro, Pixel, and More https://www.amazon.com/dp/B08T5QVTKW/ref=cm_sw_r_apan_glt_i_6T12CSF9QT1G1YCVX636