Have you considered Fast Track wheels
at Fast Track
This is the brand I've always had and I love them. The prices do not include the mounting, but even including those the total with all options on the Apollo is under $40. and with shipping, still under $50.
I love the fact that I can remove the wheel from the mounting. This means I can get the wheel installed easier, remove and replace for cleaning easier, and also interchange the location of the wheels
. The mounts can be purchased separately, so you can have both styles (cage mount and floor stand) to interchange between. This makes it super convenient to take the wheel out for "out of cage play" if desired as well. This is what I do. I have two regular size wheels
, one travel size wheel and one of each style mounting for both sizes. You don't have to purchase all at once either, if you want to add another option of mounting, you can do a separate order when it's affordable. I've had my original, regular size wheel and cage mount since about Spring 2012, and it's still going strong. Then I got the travel size, but I can't remember off hand exactly when, but it was before I homed Ollie in November 2013. My Ollie came with a Fast Track wheel also, on a floor stand (conveniently), I do not know how old that wheel is, but it's in great shape as well. They do offer the "nail trim" package as well, if you're interested in those.