That might have only been a system error, or something that was fixed soon thereafter.
Currently even with the free membership you get a 30% off voucher for shipping costs. There's also some coupon codes you can easily find online that will work for shipping, did a shipping request two days ago and got 15% off my shipping fees.
So far no real issues with them, much better than AGS, the only crap thing is the random item value they give each item, even if there is an included invoice with the purchased item, then you have to upload the same invoice and have someone manually review it and correct the value, this can sometimes cause a two day delay, other than that no issues. Shipping fees via DHL is a bitch though, but 100% worth it as their customs clearance has top priority and is super fast.