Hello and welcome
I used ebay cheapies as part of my stash with ds from about 4 months until now when he started his potty training. I think there is quite a love hate relationship with them but i found them really good and reached for them most of the time.
I think i got about 10 for £16 at the time before i relised how many make where out there i wanted to try.
They fitted my son really well but towards the end i did have to add extra boosters to them but i think this was mainly because he was older and drinking more. Once they were boosted they were fine.
They dry really quickly as well and i found them great for boosting my stash up and dh liked using them.
I don't think it will hurt to get a couple, even if you end up using them as spare. I still use mine now without the boosters as a swimming nappy