If you wish to find UGC team then the ugc forums would be best however I have a few more things to say about esea before you decide.
Generally allot of people are willing to pay for others as long as they care to commit and improve. However for ESEA it is in between seasons so its a bit harder to find people to pay. Just bring it up with the team you are trying out for. I will say that the fee helps weed out people who just wanna play and don't wanna improve. I learned more my first season of open than my 6-7 seasons in ugc combined. Like wolsne said it will be tough to join a low-mid open team but its well worth it if your mindset is correct. don't expect to be winning many matches in your first season of ESEA or in general. Your mindset should be to scrim allot, get rolled in matches but find good scrims and review your mistakes and learn. Hope this helps.