Seems like a lot when adding up totals. I'm sure we'll be over $500 in a year. May be there now!

Biggest expenditure - DaVinci SF syrups. We have about 20 bottles at any one time. My DH no longer drinks regular soda, only custom ones. So we've saved a lot of money by not buying soda. A lot of the LC items are trade offs. Yes they cost more but we would have purchased something similar so you can't count the entire cost agains low carbing. We've always gone through lots of nuts and coconut so I won't count those at all.

Low carb products in order of frequency of use at my house:
SF DaVincis
LC Ice Cream
RS Candy
EAS AdvantEdge bars (favorite but buy other brands on sale)
Almond Flour
La Tortillas
LC Bread
Flax seed meal
other baking stuff (vital wheat guten, soy flour, raw wheat germ...)
Atkins bagels

Have but rarely use:
Baja Bobs LC drink mixes - got us through some hot nights this summer!
Keto Ketchup (a must for cheese steaks)
Banana Nut LC hot cereal
LC jelly
Vanilla whey protein powder (for baking but I don't like the taste)
ThicknThin

Tried pasta once - didn't like it at all. Bought Keto Krisp to make cookies. They were great but the cereal cost way too much so never again.

I'm sure I'm missing a lot of items but I'm drawing a blank.