Hello and welcome to the forum. I would suggest that you purchase some 2.5lb plates and take them with you to the gym. They should be pretty cheap and will give you much more flexibility as far as loading the bar.
I have been in your situation before and this is exactly what I did.
If 5lb incriments are too big for you, you can also find 1.25lb weights online, however they can be a bit more cost wise.
Zdravko Veselin Gaeta
I am not a powerlifter nor am I a bodybuilder. I just want to be big and strong.
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