Most of my orders are larger quantities (6-12), unless I am getting a more expensive item, then I am usually down to 2 or 3. I try to save EF and I on shipping as much as possible. AND it is more fun to have an abundance of new presents to play with!!!
At least 2, never less (since I ALWAYS grab a free item!) but it really depends on how many points I have. I can't afford toys, not even the $3 Frisky Fingers, so I only use points and gift cards that I earn/win to get the things I want. I am currently saving for the Jopen Intensity and am so close I can taste it!
I never get less than two items (including my free gift) and so far, I haven't gotten more than six. I can't justify making an order for just one thing (excluding the free gift) unless it's part of a very limited sale.
I usally have a set amount of money I can spend. How many items depends on how expensive the things I want are. Because of the coupon and points I have saved my next order will have 6 or 7 items, including the free wipes!
I go more by price than number of items, but I'd say I average 4-8. I always order enough to get free shipping, but if there's a promo (like now) with a better discount for ordering $100+, I take advantage of it as long as I have enough points/gc's on hand.