I must have done everything on the cheap.
For b/f tops I used a cami top under my clothes - pull up outer top, pull down cami. no ginormous belly showing! result.
I used the same bras I had in pregnancy, but sewed some old baby vest poppers so they could be opened and put ribbons in them so I could open them and close them one handed. I basically copied the bras in Mothercare.
extra food:I did buy a carton on soya leicithin for me to sprinkle onto my cereal in the morning to emulsify the breastmilk and stop mastitis and blocked ducts. ?6. The rest of the calories came from the fat stores in my own saddlebags!
I bought a boppy cushion, and it doubled as a prop when my DD was sitting up - 7 months or so. I didn't buy a gym as I didn't need one with the boppy.
I also used ebm and used a handheld avent pump.
For breastpads I cut up sanitary towels I hadn't used for the lochia. I bought them on special offer, and as I had a cesarean birth I had too many of them.
I also ff with soyaSMA using the avent bottles. About 2X3oz a day. A can every two weeks or so ?11.
I used the dishwasher to sterilize bottles and didn't bother with the sterilizer I borrowed, as it didn't fit into the microwave.
It's not that expensive to feed a baby, nappies are another matter, and of course childcare is expensive when / if you go back to work..
I borrowed a travel system and a buggy, and bought a sling. HTH
keep us posted on your research results hunkermunker!