It’s relatively easy to make your own earthbag tampers, but some may decide it’s simpler and more expedient to just purchase them. Here’s one tamper I came across after a quick search on the Internet: Ames True Temper 8″ x 8″ Tamper, 42 inch hardwood handle, $24.98, available from Lowe’s building supply centers.
Ames True Temper Earthbag Tamper
Earthbag Building Blog 