While looking around for bits I came across these little beauties - V623ZZ v-groove sealed bearings. Only 30c each: http://www.aliexpress.com/item/10pcs-V623ZZ-V-groove-roller-wheel-ball-bearings-3-12-4-mm-embroidery-machine-pulley-bearing/32226374792.html
3mm ID, so perfect for M3 screws, with a 12mm x 4mm pulley.
By my estimation, there’s 14 pulleys on a Eustathios - so for $4.20, you get steel and a sealed bearing inner. Can’t print better than that!
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