Yeah, the $97 ones are always available (from customers).
When you see a promo code that's all numbers, it's directly from Dreamhost. The rest of us have to add letters to the mix.
Note that they all have certain restrictions. The full amount only applies to yearly payments, but even the monthly plans get at least $50 (setup fee) knocked off.
There's not much of a reason to go monthly, since you can get a year of L1 for barely over $20 with a $97 code. And there's a 97 day money back guarantee, as long as you pay with a credit card.
Save up to $96 at Dreamhost with ALMOST97 promo code (I get $1).
Or save $97 with THEFULL97.