Amazon has 3/4” 2x packs for $12. The 2” drain ones were also on Amazon for about $13 each. The 3/4” are pretty good and seal well, the 2” are a bit more fidgety.

https://www.amazon.com/dp/B07XRGNXWL/ref=cm_sw_r_cp_api_i_1CYAB6SSH94GVAWS5938?_encoding=UTF8&psc=1