You should be able to find toys from the Generations line still in stores. You will find guys like Kup, Scourge, Red Alert, Soundwave, Megatron and probably Skullgrin. They are going to release a new Junkion based on the Wreck-Gar toy and Sky Shadow based on Japanese Black Shadow soon. If you are looking to pick up a neoG1 style collection odds are you're gonna pay for it and find them on places like ebay and Crave.
The three pack with Galvatron\Cyclonus\Rodimus was an Asia exclusive, while a Battle in Space set was released in U.S. with just Rod and Cyclonus.
Check out this sites toy galleries for detailed pics of figures that may interest you.
http://www.seibertron.com/transformers/toys/series/classics/98/They have also seemed to sneak in G1 homages in the movie line as well. Figures like Bludgeon are great, even old Go-bot homages like Fracture(Crasher) that use the Classics Mirage mold.
You will find the updated G1 toys in the Classics, Henkei(Japan Classics), Universe, Reveal the Shield, Generations and United(again Japan imports) lines. Reveal the Shield are currently being found in discount retail stores like TJ Maxx\Marshalls\Ross, while Generations can usually be found at places like Walmart and Target.
Hoped that helped.