Now, before anyone says "Pffft! who wants 3x D&D?" I need to state the following - I've used a number of the adventures offered below with OSRIC and Swords & Wizardry and converted on the fly. I never played, let alone ran, 3x era D&D and it was easy as pie. The adventures are written in an "old school" manner.
I have many of these in print and others in PDF. The worst ones are good and the best ones are simply amazing.
50 Dungeons from Bundle of Holding features some of the very best adventures from Goodman Games. The Adventure Begins & The Adventure Continues are practically worth the price of admission alone. Add in 23 more adventure modules and you get over 60 low-level adventures for 20 bucks. For about 45 bucks, you add in Castle Whiterock (a mega-dungeon), Gazeteer of the Known Realms (an excellent setting), and another 19 modules. You have a lifetime of adventure for less than 50 bucks.
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