Well about 2-3 yr ago I snagged a F26E 38 gal off EBay for about IIRC about $108 delivered & put under rear of my '90 CCLB dually. I had been watching them & they go down to like $85 or so then back to bout $135 or so. On one of the dips I caught it about $107-108.
I also found sending units on EBay at T-REX back in Iowa. Their store:
www.ebay.com
I managed to find a phone # & called T-REX directly & ordered a front & rear sending units for my '90. Saved at that time about $10-15 dealing direct instead thru EBAY with them.
Incidentally I remodified (bent & lengthened) the new sending unit & pickup, added & lengthened things. Did not put a new showerhead back in either.
One of these days soon I'm going to drop front tank and put the new front sending unit in that's still sitting on the shelf.