They are like these
http://www.amazon.com/HQ-Kites-Designs-Roller-Skates/dp/B002BJU8V4/ref=sr_1_1?ie=UTF8&qid=1363497032&sr=8-1&keywords=wheels+for+shoes
Selling for 10 dollars. Pick up on campus.
Please do not message this poster about other commercial services.
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