I have a 2001 Honda Accord Lx. I am having

lock acculator needs replacimg

Put a new battery in remote

the cheapest place would be to check with the junkyards.... but i also know that advanced auto parts carries a wide variety of door lock switches

You most likely have a fault with a computer. Unless you have wiring daigrams and a low impedance multimeter and the knowledge to not cause additional damage I would take it to the dealer since you may need reprogramming after they fix it.

gently tug the passanger side door handle from the inside (with out opening the door) than try the key fob

You may get lucky by spraying penetrating spray like WD-40 inside & all around the latch assembly on door. Use that little red nozzle to get around in behind as far as you can, as well as try to get it along back of sides as well. That will allow it to run down on linkage to locks etc & hopefully free things up & get them moving better. Once it's freed up again, give it a coat of white lithium spray grease and use tube same as you did with penetrating spray, to avoid/prolong repeat in near future. Let spray work a bit then start moving lock manually at first, then try using power after it feels easier, and then keep working both until power lock works good. Don't go crazy & overheat power lock motor, give it a few minutes after trying 5-10 times, before trying again.

check fuses & relay they may be bad

Press the passenger side door lock button. if the driver side door unlocks now but wont unlock when you hit the driver side door lock button, it is usually a network communication problem with the B CAN or a faulty Body Control Module.

replace the pass side door lock actuator

Take it to the Honda dealer, they will fix it for free, known problem and under factory warrenty.