Granite, if they were $1.75 each I'd keep the ones you already have coins for, but no holder. Some protection is better than none, IMO. Most of the bullion dealers such as
APMEX, Provident Metals, etc., will sell you a bullion
ATB and ship it in a free Z5 Air-Tite, but not all. The large size of the coin makes it really easy to mar and mishandle. I bought 10 to store the 1 set of 2010s that came from Jack Hunt in bubble mailers, plus a couple of extras in case the 2012s start rolling out, and the new style holder is not yet available.
Edit-For storage options, in case you are interested, I am using the PB7 paper box with the #715 storage card. The box is 7x14", 3/4"H, the card is velour on one side, black paper on the other and holds 5-Z5/Z10 holders. The card comes in standard black, burgundy, dark blue, green, and red. The cost is $7.50 per box/card combo, and can be directly ordered from
http://www.airtiteholders.com. It's a good temporary storage measure, and corrals the loose Z5s from rolling around in a box or coming into contact with each other. Eventually, I will have a cabinet made with slide out drawers for both the bullion and uncirculated sets.