I would not trust a place that is really low on prices, because of all of the problems that have been happening with the cheap Chinese batteries. It is not fun when a Lead battery swells.
I've certainly seen swollen batteries but those are not limited to Chinese made. And not all SLA batteries sold on-line are made elsewhere. Many are made here in the US, or Mexico, or elsewhere. Because they are so heavy, shipping costs are extreme. And even US made batteries can swell if exposed to excessive charging voltages or other abnormal conditions. But even so, if you note those
Tripp-Lite replacements
they are,
Approved for transport by air.
D.O.T., I.A.T.A., F.A.A. and C.A B. certified
U.L. recognized under file number MH 20845
CE certified.
So buying local is admirable. But in this case (if you do your homework - which you need to do anyway), safety is not a reason to avoid buying SLA batteries on-line. And as I showed above, they are often the exact same batteries. I prefer to buy locally too, but if the prices are not even close, I won't.