PRICELESS, you say. FE7 F2P Ch19xx. 

F2P Challenge rules:
No DLC.
No money can be spent or rather used.
If a Character requires money to join, Farina, Rennac, Hugh..., you must give the lowest money possible to join. That character can't be used for anything else than trading, meatshielding and moving only for the forced deployed maps. Its inventory can't be use either so I suggesst discarding it as soon as possible.
General rules
Highest difficulty possible for the challenge( Awakening can be done in Lunatic, don't ask me for japanese exclusive titles).
No deaths
Full recruitment
Max paralogues (3 Houses not really)
Those three requirements are ordered.
FE7 items & weapons locations:
www.fireemblem...
www.fireemblem...
Note: Not every item/weapon is listed here. Most weapons from unit's inventories aren't so I'd suggest to look the character page as well.
Fe7 Character data:
www.fireemblem...
FE7 Main page:
www.fireemblem...
FE7 Turn Limits I may follow, just to avoid extreme abuse:
serenesforest....