What part of the U.S. do you live in? I know we don’t get nearly everything, but I think we have tons of good options available to us, especially if you’re willing to ship from other states (and your state allows shipments from other states).
Fun lists: no order Falkenstein, Keller, Schaefer Frohlich, Merkelbach, Weiser-Kunstler/Willi Schaefer/JJ Prum/Lauer. Funniest fact have no clue on how any of the recent vintages are as these are mostly to drink later. This is the how challenging it is to purchase and taste Riesling.
I like Keller’s sweet wines quite a bit actually, and they’re easy to find. I’ve had (and own) a fair share of Keller’s von der fels and other bottling below the GGs, and they’re fine, but based on those wines Keller certainly wouldn’t make my top 5. My point is not that I’m not prepared to drink Keller because I can’t get the G-Max, but rather that I haven’t had enough of the wines that people then make his wines special.
It was easier a few years ago. With Terry Theise no longer involved in the company with his name and Rudi Wiest no longer in business, it seems like distribution of German wines is not as robust as it was.
I was often told by German producers that the sweeter wines such as Spatlese, Auslese, BA, TBA and Ice Wine was majority of the time sold to the UK and USA market. The Trocken, Kabinett and GG were the wines of choice in Germany. Always found that interesting.