Just from personal experience cash gifts to employees can backfire because on average people are selfish and when you give cash many will get upset because you could have given more. What I do is give coupons for free lunch like I’ll buy them a plate from any nearby restaurant. It’s pretty inexpensive and it makes them feel like money is not an issue since they can choose any menu item.

If I’m being honest there are no good options for not spending to appreciate employees. There is always a cost but it’s worth it if you genuinely care about your employees. The more they feel like you care the cash value of your gift becomes less important.