Not ARM microcontrollers, which the OP specifically references. NXP’s LPC810 & LPC1114 are really the only game there, and they don't support external memory AFAIK (and it's an M0). Of course, there are a lot of shops bonding an QFP ARM or similar to a slip of PCB that's DIP form factor, but that's not exactly the same.
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A lot? Make that pretty much all. The only things you still find in DIP format are very low-end micro-controllers.
Not ARM microcontrollers, which the OP specifically references. NXP’s LPC810 & LPC1114 are really the only game there, and they don't support external memory AFAIK (and it's an M0). Of course, there are a lot of shops bonding an QFP ARM or similar to a slip of PCB that's DIP form factor, but that's not exactly the same.