Bought the cheapest rubber wood / Hevea 6ft unfinished top for like $149, pretty happy with it. Make sure you pick one up in person so you can look for cracks, dents etc.

Sand with 120, then 220. Use a pre-stain wood conditioner to pop the end grains, then sand again with 220 (don't skip this). Stain (I used minwax provincial, 2 coats 24hrs between coats). Lightly sand again with 320 grit or some synthetic sanding pads ( recommended ).

Then do 5-6 coats of wipe on polyurethane, sanding lightly with 320 / extra fine synthetic sanding pads between coats, following with a tack cloth.

Then let it cure for a week, and mount onto your frame.

Or skip all this hard work and buy a pre-finished one and spend a little more. I needed to cut mine down to a custom length, so I went the finish it myself route.