If you take part in this survey, at the end you'll be asked for an email address. If you leave an email address you'll get a promo code worth €6.50 to be spent in their e-store. Incidentally, they have 4 sprues/kits available for exactly €6.50 (you'll have to pay for shipping, that's why I put "almost free" in the title. I've paid €1.95 to have the sprue I want shipped to Italy).
I've got my promo code moved to spam folder by my email filter. So, if you don't get it in a few hours after completing the survey, check your email spam folder.
Disclaimer: I am not associated in any way to Wargames Soldiers & Strategy magazine, if I post about their survey it's just because I think many players here could happily enjoy a few toy soldiers for just the cost of shipping. In case you feel this post is unsuitable, please remove it.