Sponsor items tend to stay pretty cheap, even the high quality ones. So I'll post some of my favorites on the lower price ranges. (one million or less) Later I'll make a post for some of the pricier ones. (but by normal item standards, they're still pretty cheap)
Ubi Ramen is less than a million gold and has a few different pose options.
Beastly Rose is a gorgeous handheld rose. Runs as little as a few thousand gold.
Year One Soldier's Sword is less than a million. This basic sword is easy to incorporate into many avatars, and is a great option if you want a nice weapon without spending tons of gold.
Syaoran's Goggles are a million gold. Like the Year One Soldier's Sword, the simplistic design makes it easy to use.
Secret Homecoming Tiara with Amethysts is a simple but pretty little gold tiara with, well, amethysts. Runs less than 20k.
Mall Cop Segway offers a nice-looking Segway at 40k. From the same sponsorship, you can get a nice security guard shirt out of
Mall Cop Shirt for 50k.
Harry Potter's Wand is less than a million, and like some of the other sponsor items here, it's easy to use thanks to the simple design. Same thing applies to the 50k
Harry Potter Student Cauldron. And for fans of Harry Potter specifically, the
Golden Snitch is available for less than 100k.
Planet 51 Space Suit is a nice-looking, well, space suit. I actually like it better than the Cash Shop Astronaut Suit because it's not as bulky. (though it doesn't have a helmet) This only runs a few thousand gold!
Popstar Guitar is a cool electric guitar for 200k. Great option if you want a musician avatar without spending tons.
A Men's Wearhouse sponsorship brought us two fantastic suits for less than a million each: the
Flirty Suit is 800k and the
Spring Suit is 400k.
All of the Coca-Cola items have an ABP of less than 100k.
G-Rave Belt, from a contest sponsored by Coca Cola, is 10k.
Detective's Magnifier is 5k.
Zhou Yu's Staff is a nice red and gold staff available for 500k.
Skintimate Fruit Foam Fascinator is a lovely headpiece that only costs 5k. Great for any fruit and food themed avatars!