Just to give you my 10p's worth, why not look at a completly different business on eBay. Lots of other sellers sell designed glasses, and you have to be VERY careful that you don't end up selling fakes?
Why not use the business you have been in for a long time, and make some money through that route? What am I talking about......
Clothes for Builders, easy to get hold of, good prices and nice profits + you already have contacts in the business?
Have a look at
http://www.thatchreed.co.uk for new clothing. Just a quick look on Google will bring up other companies doing the same type of thing as well!
Good luck