First of all, if you're in CO, you can buy high quality se-eds legally over the counter. Right now you need a medical card (which apparently isn't particularly hard to get) but IIRC, in Jan it will be open for anyone to buy these. You can also buy se-eds legally from dispensaries in CA, and I think a few other places with a card.
You won't get the same massive selection as at a big overseas bank, but IMO its a very good option. Rare Dankness and 303 Se-eds are two CO-based outfits that sell in state and reportedly have absolutely top quality product. Alphakronik is also in CO, and supposedly has some good lines, and I'm sure there are others now and will be more soon. In my opinion, you're better off picking from a short list of excellent beans, than a ridiculously long list of beans of various and uncertain quality.
Yes, apparently US customs has been focusing more on confiscating beans and they've been having significant success with it. Part of this has just been a massive explosion in small home growing with medical legalization/decriminalization. More people are growing then ever before, and more beans are being shipped than ever before.
As mentioned, some outfits use better stealth than others, and some originating locations are under higher scrutiny than others (eg any small package from Holland is automatically suspect).
But the fact is, beans are small and easily hidden. With so many thousands of letters and packages coming into the USA every single day, customs is never really going to be able to stop all of them; they can only increase the percentage they capture, discouraging buyers, and driving up costs. I think there is going to be some industry shakeup over this, with increased costs and fewer outfits willing to ship into the USA.
On the other hand, right now I know of at least two breeders inside the USA who will ship beans domestically, avoiding the customs issue. Obviously, individual small growers can generate their own beans, and sell/trade between each other, again, avoiding customs. While home-made "pollen chucks" have a bad reputation, the fact is, some of these are as good as some of the commercial lines.
While true Federal cannabis law reform is probably a decade off, I do think that with increasing domestic legalization, domestic sources of beans will only increase in number with time.