Hi! I'm sorry you didn't get a reply - I did a search engine search for lactate ringers cost and got some results. Maybe you could try that?
Also, there's this TCS thread discussion - it starts about a year ago and progresses so prices may not be too far off... Where To Find Lactated Ringer's For Ckd Cat
I bought my IV set-ups from Med-Vet. here's the link: Administration Sets | I.V. Administration Sets | Shopmedvet.com I got my needles from wherever I could find them. Usually I would just google for Terumo 19 or 20 x 1 gauge x 1 inch thin walled needles. In my opinion, those are the very best out there.
As far as lactated ringers, I used to get them at Walgreens. They used to have a deal for pet owners, but not sure if they have it anymore. But Costco probably has a good deal, and you don't have to be a member. Sometimes lactated ringers aren't available though, anywhere. If that's the case, soo if your Vet can issue a prescription for a different fluid.