Yeah, found a US manufacturer can do 36V20AH with charger for about $520usd, the SLA's will cost $210 without a charger, the SLA's are 16lbs heavier and overall weight is a factor. If I do two LiFePO packs, I end up 4 lbs heavier than the SLA's, so I'm saving.
Just not really sure how far 26AH will get me with pedalling and such. I also just discovered aluminum front forks so I'm thinking of starting small and investing to beef the frame up. I can stretch this over time and do it right, I think.