Powdervalley does have the best normal pricing.

My best deal was $20 a bottle from Cabelas when its on sale. Stock up when you can and the price isnt that bad.

I use mostly Win209 primers (in modded plugs) but when in doubt try the CCI209M or Fed209As also. Mag primers build carbon in the plug quicker so i only use them if i must.

RemSTS primers are also good if they fit your gun well.