Is there a way to be able to get to ebay around my company's firewall?
Answers:
Visit ebay.com using public proxies or thro a anonymizing service (like anonymizer.com).
Other answers:
yes you could use a proxy server.
try hacking
If your company has blocked access to eBay questions are going to be asked if you discovered bypassing the firewall.
A good firewall will also be blocking the known proxy sites.
Ask yourself if it is worth the loss of your job and cant wait until you get home.