I definitely recommend the Amazon Basics one along with /u/DatAperture. There are a few different companies that make identical versions, and Amazon Basics is usually the cheapest. These are great for hobbyists because they tilt up and down, rotate left and right, and they have a basic (probably not terribly precise - I'm still testing) amount of power control which is incredibly useful and will take you pretty far into working with strobes.

Combine one of these with great lessons from Strobist, and you'll be set until you're ready for a great $100-ish Yongnuo knockoff of a Nikon/Canon speedlight. If you're looking to blow a hundred bucks right now, then these will work out really well and should last you a long time.

Worst case: When you upgrade, you'll have an extra piece for more complicated lighting setups. I'm having a blast with these $30 radio triggers on my Canon rig with a couple cheap, basic strobes.

Recently got a speedflash (SB-700) and I'm looking for a remote trigger system, as I have a D5300 and that doesn't have a commander mode. Budget is $100 ^{but being below it would be great.}

I know some people in this thread recommended the Yongnuo YN-622N or something from Godox (looking at the X1N Kit), but I noticed Altura has a kit with two receivers for $30. The biggest disadvantage I can tell is that I can't remotely adjust the flash power with both the Altura and Yongnuo kits.

Just looking for opinions or suggestions here/if I should spend the extra $50 on something like the Godox kit. I'm also looking at 2 receivers as I occasionally can get my hands on an SB-900.