I shop at the .99 cent store for fresh fruits and vegetables which really help keep the cost down, and now they're starting to sale gluten free items too. What I don't find in there I go to my local store. But I find that less carbs like pastas and breads is better and more fruits and veggies also portion control works for me.
I don't know about anyone else but, I'm on prednisone so I have to work extra hard to resist the temptation of sweets of all kinds!

I am doing WW as well but I am vegetarian so no meat, an occassional egg but what has been the most beneficial for RA has been no sugar that is not a natural fruit, including no grains because they break down into sugars. When I am strict with that, the pain is minimal. When I fall off the wagon it is unbearable pain

I’m actually doing the WW points system. It’s easy and becomes quite addictive. It’s basically cutting out carbs, sweets, some dairy and eating leaner meats like chicken or seafood and plenty of fruits and veggies. I am feeling better RA wise the past two months and I’m losing weight. Win win!

I personally have stopped eating deadly nightshades such tomatoes peppers or potatoes plus walnuts. Got of Rhuematiod Noddles which came back soon as ate them.
Next want to try juicing up a bunch of celery minus leaves. Taken daily every morning before breakfast is supposed to help RA.
I know eating green veggies, fish, sweet potatoes, lemon juice on appragus, pineapples, goats cheese or sheep's cheese helps me.
Lamb , chicken/Turkey are ok but no pork or very little beef as very high in acid.
Buy frozen blueberries as better than fresh. Try payapa fruit as a half a piece before each meal is supposed to help over a fortnight.
Avoid alot of bread,pizza, cakes, biscuits or chocolates as high carbrohydrates where as fruit and veggies are low carbs.
Look at drinking Rubous tea, Green, Mint or Lemon and Ginger to help ,so avoiding coffee, dairy and tea.

With RA I try to eat mostly vegetables and fruits with less meats. Portion control is very important. My husband was tested and found to be borderline type 2 diabetic, so he joined a diabetes education program. We (my husband and I) have been eating dinner on a salad plate size for years. Salad dressing is measured and always on the side at restaurants when we go out. In WV we are very blessed to have access to farmers markets throughout the year. In the summer we also purchase a half share of a local farmer’s crop from June til October. It is a CSA ( Community Service Agriculture) program. The half share is enough for two of us for two weeks. Since it is prepaid, we used all of it. Even the vegetables we have never tried before. You have to plan and cook each day. When I stick to this approach I feel better and maintain my weight.