You can buy 7' Carlisle 2 pc economy oars at Cabelas (with olive shafts.) Decent quality, and they work. Around $60-ish each if I'm not mistaken.They're also pretty much the same as all the stock oars from Outcast, Bucks, Scadden, etc. In fact I think most rebadged oars are Carlisles if I'm not mistaken with just different aesthetics or labelling.
Hard to go wrong with the Sawyer or Cataract oars but depending on the width of your frame, the 7 footers may be too short or just right. I'm guessing JW Outfitter frame, which is narrower than the ones I'm used to, the 7 footers would be just about right.
For my 10' by 20" pontoons with a heavy duty, 60 inch frame, I have used 20-30 pound chain and lead pyramid anchors and have probably done that in heavier water than most. My preference would be closer to the lighter side of that. For your boat, though I'm not super familiar with the model, I would think closer to 12-15 pounds would suffice in lighter river flow.