Super useful things that I use every day, or nearly
Crib and Changing Table - 200.00
I bought these used from a friend. The crib is a drop-down model, but she used it successfully with two babies so I am not too worried. Also, my back has enough trouble picking up babies as it is, I am glad that I don't have sides any higher than they are already. The changing table is great - I'd get one again. If you don't have a friend getting rid of theirs, though, it's a great piece of furniture to pick up at a secondhand store.
Pump in Style Breast Pump (Backpack) = 266.69
This has replaced the Lactina Select Hospital Grade Breast Pump I rented previously with no problems so far. It does get condensation in the tubes every time, though, which is kind of a pain. If I had it to do over I might have just rented, especially since the window of time I plan to spend nursing shrinks the longer I do it.
Simple Wishes Hands Free Breastpump Bra = 37.99
An essential accessory to anyone who pumps with an electric pump. Other websites have suggested cutting holes in a sports bra but at my current size (38G) that would be more expensive than this one is.
Medela Tender Care Lanolin x 2 = 17.08
Nipple Cream is also essential if you plan to pump. This is my favorite of the two I have tried.
The First Years BabyPro Bottle Warmer x2 = 31.08
Mr. Goat uses this every day (I seldom bottle feed the babies). But we only needed one.
Carters Keep Me Dry Flannel Bassinet Pad x4 = 27.96
Convenient for changing babies on when you don't want leakage (on beds, etc.) As with the bottle warmer, though, we didn't need 4, 2 would have done.
Changing Pad Cover x 2 = 35.98
Keeps urine and feces off the changing table. The pad under these can be wiped clean, but it's much nicer to just toss this in the washer, and the babies can't kick it away like they do receiving blankets.
Cloth Diapers - 537.03
Huggies Pure & Natural Diapers, 160 count x3 = 143.94
I thought Cloth Diapers were really expensive - until I looked at paper. We mostly use cloth, but paper comes in handy for excursions and those nights when all the cloth diapers are in the wash. They go through them like mad; I can't imagine what we'd spend a month if paper diapers were all we used. Plus, paper diapers are an environmental disaster. So we try to minimize their use, and most nights we are even successful.
Things that I no longer use
Platex Drop-Ins Newborn Starter Set x 2 = $29.03
This looked like a good idea, but wasn't a time save over other bottles. I'm washing all my breast pumping equipment 3-5x a day anyway, so these don't save me any time and continue to cost money for the plastic liners. Not to mention they are bad for the environment.
NUK Orthodontic Latex Nipples = 2.37
Playtex Baby Drop-Ins Orthodontic Nipple = 5.20
Accessories to the above.
Things that were never useful, or that I haven't managed to use
Baby K'Tan Sling x 2 = $109.98
These would probably be great - if I ever had time to figure out the manual. I should have bought a more intuitive sling, as I have not ever found the time to figure out how to use these complicated babies. Hopefully I'll be able to wear them a couple of times before the babies get too big, when I have enough sleep to read the instructions.
Graco Pack 'N Play Twin Bassinet Sheet x2 = 21.98
The actual Pack 'N Play is super useful; I got the kind with the twin bassinets and keep the babies in them at my Mom's house. But these sheets are crap - ill-fitting and cheap feeling.
Baby Sign Language Basics = 13.57
We haven't used this yet, but they are a bit young still.
Medela Pump & Save Breastmilk Bags with easy-connect adapter 20-pack = 12.99