You will either be given a free gift or given a chance to trade-in products of the same category, irregardless of brand and condition, to offset the purchase price of our products. For some products, you are given the privilege of choosing a free gift or a trade-in.

An eye for an eye. A shredder for a shredder. And a laminator for a laminator. 

No, trade-ins are only for products of the same category. 

It means you have the choice between a trade-in to offset purchase prices or a free gift.