You're last poll option threw me a bit, what's "plain material"?
For cut vinyl banners I buy roll stock 14 oz. Banner Max from Fellers in
36" - White, Yellow, Blue & Black
48" - White, Yellow, Blue & Black
60" - White, Yellow, Flour. Orange, Red, Blue & Black
For digital printing I buy 13 oz. Vyjet scrim banner material from Fellers in
30" - White
Most banners recieve taped hems & grommets unless sewn hems are necessary.