Steve:
I recently had a set of Zeus decals made at the place Dale recommended awhile back:
Ric Keller
The Personal Touch
custom miniature graphics
19 Lakeridge Drive
Georgetown, MA 01833
978.352-2760 FAX: 978.352-4908
http://www.hometown.aol.com/
This included a downtube image, a seattube image, a headtube image, and front-fork images (late-70s Zeus bikes had a 'Zeus' sticker on each fork blade so the brand-name would be obvious in those head-on victory photos). The price was a $20 for a one-time set-up charge and then $20 for the set of decals and postage.
By the way, I haven't deployed the decals yet. Zeus bikes came with stickers printed on metallized-chrome-look vinyl, so I'm going to have to experiment with applying these decals to some adhesive-backed chrome vinyl from one of those sign shops.
Apparently there are several reputable painters who have actual zeus stickers, but of course they're only available if one has the bike painted. Back when Zeus was still in business, they used to sell sticker sets for just six lousy bucks. Wish I'd bought a lot more of 'em.
Brad Stockwell
Palo Alto