the small or medium flat rate boxes should work and are quite reasonable. save your receipt. the usps is still the least expensive option and they offer a variety. you can go to their web site, click on shipping, give them zip codes, to & from; size and weight of package and they will give you all the options and prices before you ever go to the post office, you can even print the label ( if you use a credit card to pay for the postage) put the label on it and the postal worker who delivers your mail will pick it up...no extra charge.........and no, i don't work for the usps,,, i just send lots of stuff all over the world. :)