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lsresearchchems.com, longflourishrc.com & theresearchchemsclub.com are sales-agents / shops for the same lab. While LS usually would not offer remarkably toxic substances, the other two offer all chems their lab produces, even the highly toxic BTCP and Nitazenes.
Quality is outstanding, better than with XC, on par with Rechemco, better than shops from the Netherlands. Of course, not all their products you will like (this lab constantly makes new substances available) but quality should always be fine.
Service and order processing are good and fast.
Shipping takes maybe 2 weeks.
Their prices for one gram are rather expensive, if you order 5 or more grams of a substance, their prices are top. From time to time, they offer generous discounts on substances!
Downside: Their bags are not labelled! Be careful, if you order multiple substances at once!
One of the best shops around, world-class.