Don't know anything about your Dewalt 120, but portabands in themselves typically have a extremely limited blade tooth availability. Things might have changed in the last few years since I bought any portaband blades, so consider that also.
When I worked at a shop, we had a HUGE bandsaw(250"), and if they broke a new blade, I would take the broken piece over to a local saw shop and get him to weld up some portaband sized pieces out of it. He always told me that it "wouldn't work" because the blade was too short and put too much tension on a weld, but it always did. I got some really interesting blades, such as a radical 4t/" that cuts aluminum like butter. Bi-metal seems to work best and the name brands like Lenox and Starret seem to be better than the harbor freight ones. One word of advise, keep as many spares stashed as $ will allow, as it never fails to be your last blade that you break right in the middle of an important job.
David from jax