There are three versions of the Red/Blue player’s guide offer, actually: U/DMG-APAE-USA, DMG-APAE-USA, and DMG-APEE-USA. The first came in all Sandshrew boxes (both Red and Blue, even though APAE is Red’s code), so is pretty common (but still isn’t sold on its own very often). The other two only came in later Red and Blue (respectively) black-ESRB boxes so are quite uncommon; I didn’t even know they existed till a couple of weeks back. *Earlier* Red and Blue black-ESRB boxes come with a generic Nintendo Power ad, but they seem to have started reprinting the game-specific offer in Japan from maybe 2000 or so onwards, with game-specific print codes. I don’t have either yet - I’ve only seen them in very clean CIB copies which sold for crazy prices, so far, and I already have black ESRB boxes for both games so paying nearly four figures just to get a player’s guide offer seems excessive 
It’s really hard to price non-first-print variants because it *is* a pain to find some of them (especially in good condition), but a lot of collectors probably don’t care. I have certainly paid over the odds for a few just to get them and not have to keep looking for them, heh. If everyone in the market wanted every variant, logically speaking, the price for something like Yellow #3 (the double-ended black ESRB variant) would be quite high, because it’s quite uncommon. But when a lot of people in the market just want “a copy of Yellow” (or, if they care about variants at all, want a “first print”) it’s harder to put a number on it.
The market price for a nice condition copy of Yellow right now is $400+, so if it really is in nice shape, that’s not a bad deal regardless. I’d probably go for it. I got two copies of that print - both from Italy, weirdly enough - one in pretty rough shape, one in pretty decent shape. I paid about $260 for each, which I figure is a good deal for the one in decent shape. That was a BIN price. The last one that sold in good shape - eBay item #324555644497 - sold for $520. The last one that sold at all was in pretty rough shape and missing all packins, and it sold for $350 - that’s #324577940727 . So yeah, I’d probably go with that $400 one if you want to be sure of getting it.
BTW, the most interesting games for variants in my opinion are actually FireRed and LeafGreen. There are six prints of each, of which three are quite tricky to find and one barely exists. I also recently figured out a way to figure out almost exactly how many copies of each print exist for each game. It’s a lot of fun for the variant nerd. 
For the two runs of Sandshrew we’re theorizing: the first run (with the flap/tab-style insert) was clearly the release print, so I’m figuring it was done around mid-1998. The second run (with the flat insert) I’m guessing happened around fall 1999, in this big rush of production I’ve been theorizing Nintendo had to do because demand was super high. I don’t think it can possibly have happened earlier than mid-1999, because remember we believe it had manuals and carts with black ESRB logos, and those logos were not printed on *anything* before mid-1999.
I actually believe they basically had the US and Japan churning out copies of all three games at that time; I think that between July and December 1999, *all of* the following prints happened:
US
* Second run of Red and Blue Sandshrew
* All no-ESRB Yellow
* At least some of the double-ended black-ESRB Yellow
Japan
* All white-ESRB Yellow
* All white-ESRB / Rattata Red and Blue
* Some black-ESRB y-fold Yellow, Red and Blue