25% off entire order (no minimum) + free prescription lenses on pairs of glasses from GlassesShop
I priced up one of their bestseller pairs, the 2029 model (Wayfarer shape) which was already marked as having 57% discount for the price of $36.90 (incl. shipping). Applying the 25% off code (see Buckscoop's Voucher page for this) the price dropped to $29.41. Not bad for a decent quality pair of prescription glasses.
It's worth point out that they're also running some additional Spring Sale discounts on minimum orders, if you're thinking of buying multiple pairs or spending more on each:
* spend $29 or more and get $5 off
* spend $69 or more and get $10 off
* spend $129 or more get $50 off
For the last one, that equates to a 38% discount if you spend around the $130 mark. So in this case it's better value than using the 25% off coupon.
What you can't do though is apply multiple coupons on the same order by the looks of it.