My wife has gotten back into some arts and crafts work. While on a trip with her to A C Moore I ran across these trees made by Creative Time.
Pine trees on the left come 15 to a pack and are 1" to 4" tall. Tree on the right is Econo Tree green which comes at 10 to pack. Cost is around $8.00 per pack. However, I run off their coupon every week and get them for half price.
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With a little work, I think they made decent trees. I guess Michaels probably sells these also.