Lots of chins live their whole lives without wheels and do just fine. Yes, it is nice for them to have, but it's not worth getting one which is a) dangerous and b) won't last more than a couple months.
Saving up for a good wheel is worth it because they last for a life time (well, a chin's life time at least)
$25 for 2 months, or $75 for 10 years?