I sold them for $2 each, 3 for $5, 7 for $10 and cheaper with higher quantities. I'd say I averaged about $1.50 each because I usually throw in extra plants with each order.
I had SEVERAL customers tell me my plants were way too cheap. I'm thinking of going up to $2.50 - $3.00 each or 5 for $10 next year.
I'm also at the point with my customer base where I don't think I'm going to take on many new customers except for referrals from existing customers.