Tri-Star aluminum wheels part # 1183 or #1184. Split wheel that uses a 5/8 bearing. App. $35 a piece.
For the inline wheels or skate wheels the best place is ebay or Amazon. Just scroll thru. You can find sets of 50 wheels for less than a $1 a piece. Discounted/blemished/discontinued. 608 bearings the same.
Best of luck. EWO