i just use reachargables and recharge 'em.

that's a good idea, i might consider that. thanks 

but my question still isn't answered.
are there any adaptors for the 84+SE or could i construct anything myself?

Find an adapter that has an output of 5-6V DC (you may be able to use an old cellphone charger for this), cut the plug that goes in the cellphone/watever device it was meant for, strip the ends off the cable and solder the + wire of the adapter to the + side of the battery compartiment (the batteries are all connected serially, connect it to the only + side that isn't connected to the - side of an other battery), and solder the other wire to the - side of the battery compartiment (which is the - side that isn't connected to any + side). You probably also want to cut the cable somewere between the calc and the plug and solder a connector inbetween.

The most important parts are:
 - Make sure the output of the adapter is not higher than 6V
 - Make sure the output of the adapter is DC, not AC
 - Make sure the polarity is correct. Use a voltmeter to test this.
If you respect the above, your calc should be fine, regardless of what happens. But to be really sure, wait for someone who knows more about how the calc functions to verify this post.

A USB charger should be fine, although you can't just plug it into the USB port. (On Nspires, however, you can.) If you want to avoid soldering directly to the calculator, you can find some battery-sized cylinders and attach a contact point and wire to an end.

If you don't solder the wires to the calc, then make sure they're attached firmely to the calc, because if one gets loose, then you'll get a RAM clear (like if you pull a battery)