there is no place that you can buy third party lab tested r-ala for cheaper.
if you could get such powder.. the cost decrease and capping it yourself, with the potential degradation + cost and effort (r-ala is more difficult to cap and does require somewhat specific capping conditions).. it is not worth it to most people.
the big problem is that if you get powder, even if you get it from a manufacturer it may just be r-heavy or even just racemic (always test the material)
remember to add cost of caps, fillers, time to see what a saving there is.
though if pure, tested r-ala, were available as powder.. it might be worth it to some people. those - heavy on time and light on cash-