What method do you use to brew coffee? Should have asked that first hehe. If you do something like French press, or even the south indian filter, then you could try ordering two sample packs. One of whole beans and the other french press/ filter grind and grind the whole beans in your spice grinder to match the particle size and see the resulting flavour in the cup. If you feel its the same, you've got your solution you can buy whole beans, get a dedicated cheap spice grinder and grind fresh!
As for sellers don't buy on amazon. Buy direct from the roasters websites you'll get it freshly roasted to order and you can order sample packs of about 100g too to see which coffees you actually like. I absolutely love Koinonia
www.kcroasters.com. They own their own farm and definitely seem to know what they're doing. There's araku.in, third wave coffee, kaffacerrado for coffees from around the world, although they roast quite a few of their coffees darker which masks the origins flavour notes. Bluetokai I had a weird experience. Ordered a sampler and a light coffee was darker in colour and a medium coffee was lighter in colour. When I wrote to them I got a weird explanation from their roaster directly which is making me think ten times about ordering from them again. Koinonia have something that you will rarely see anywhere, even abroad. They have their own farm Kelagur and offer this bean in different processing methods - washed, washed shade dry, honey, natural sun dried, purple berries picked so its a bit riper, and the bean matured in whisky casks. so you get to taste the difference that processing at the farm makes on the final cup flavour. Very few if any farms offer such a wide variety of processing for the same season's crop. Most choose one or perhaps two or three processing methods depending on the weather conditions prevailing at the time of harvest.
Regards