i found this on the net: will be cheaper than getting the adapter or extension cord.
"I was dissatisfied with the options both home depot and lowes could bring to the table in the power protection realm, so I set out to do it myself. neither the depot nor lowes carried a true GFCI multistrip or extension cord, depot did have a $40 multistrip that had a grounding fault indicator (whatever good that does). so, I went over to the electrical parts asile and began picking parts...I bought two leviton almond colored gfci without pilot light for $7.50 ea (pilot light cost an extra $4), and two almond colored regular outlets (forget how much, but cheap). In the next aisle that had plastic wall boxes (gang boxes maybe?) ... I bought two plastic dual boxes for $0.75 ea and two dual faceplates (cheap also). Going home, I dug out two 6ft shielded IEC computer power cords, and cut the iec end off, and stripped back the shielding and wires. The gang boxes came with nice 'spring' strain-relief slots that I pushed the cord through (don't push too much through, it's really hard to pull back out). After studying the diagrams and reading the instructions (very important!), I wired the cord into the "LINE" section of the gfci, then using some 16 gauge wire I had laying around, I wired the second outlet to the "LOAD" section of the gfci (be sure to connect all the grounds together!)... After screwing the outlets into their box, and attaching the faceplate, I tested it out with a desk lamp, first plugged into the gfci ... pushing test
immediately turned off the lamp, and pushing reset brought it back on ...testing the second outlet also resulted the same. Now all my fish equipment is protected by gfci, and $20 for two setups! I
have two multistrips plugged into the each of the 'top' outlets, and the bottom outlets are for big timers. I imagine if one wanted to, they could buy one of those commercial size gang boxes that has room for eight light switches in it, and with one gfci and seven regular outlets, you could eliminate the need for multistrips all together, just remember not to load it too heavily, my gfci claims 15a at 120v, but I wouldn't want to test that... If you were going to run 100's of watts of MH lights, might want to talk to an electrician.
If you do decide to try this yourself, please be very careful, and read + understand the instructions that come with the gfci, otherwise it could end up being useless or even dangerous. Also 120vac can give you a really nasty poke, and if you're grounded really well, it might even be lethal, so make sure you choose a gang box and faceplate that seal completely, so there is no chance fingers could find there way to a live wire."
Any suggestion on this?