Garbage bag ground cover - 43g, think I paid around 3 bucks for a roll of 10. One lasts me about two years of use, circa 40 nights out.
Pie pan wind screen and ground cover for stove - 7g and 2g, one pan costs around a buck.
Recycled #2 plastic water bottle - 33g, 3 bucks plus comes with fruit juice.
Waterproof maps - around 7g each, print off internet and cover with clear tape.
Mixed plastic containers for soap, hot sauce, rubbing alcohol, sunblock, etc. - Free from hotels, free samples at drug stores and girly shops that sell skin lotion and such, etc.
Mini toothpaste tubes - Free at dentist's office, and I am not shy to ask for several.
Wind pants - 155g, Nike running pants on sale for around 10 bucks at sporting goods store.
Foam sit/kneel pad, also backpack frame and torso sleeping mat - 40g, MYOG from leftover piece of foam mat from trimming a regular foam mat down to 2/3rds.
Small packs of salt, pepper, ketchup, sugar, etc. - Free from fast food joints.
Alpaca gloves and socks - 28g/45g, I paid about 5 bucks for both plus a hat (I wear the hat but not backpacking--other hats are better/lighter for BPing) while traveling in Bolivia, and these are my favorite/softest gloves/glove liners and sleep socks.