Can't be sold item

The values here seem to point to where it goes after selecting "Buy" "Sell" or ... Exit (Not sure on the last one, B7A0 seems to take a long path for an "exit" choice)

Code:

C3/B79A:    A3B7        
C3/B79C:    C7B7        
C3/B79E:    A0B7  
    
C3/B7A0:    4CB3B4        JMP $B4B3

If you replace C7B7 with A3B7 it will open the shop's item list when you select sell. Which seems to point to C7B7 (or C3/B7C7) as being the start of the "Sell" process. Which goes through a ton of jumping in circles. Eventually leads to this (Every Jump seems start at a different LDX command though):

Code:

C3/6A15:    A600        LDX $00
C3/6A17:    8035        BRA $6A4E
C3/6A19:    A20008      LDX #$0800
C3/6A1C:    8030        BRA $6A4E
C3/6A1E:    A20010      LDX #$1000
C3/6A21:    802B        BRA $6A4E
C3/6A23:    A20018      LDX #$1800
C3/6A26:    8026        BRA $6A4E
C3/6A28:    A20020      LDX #$2000
C3/6A2B:    8021        BRA $6A4E
C3/6A2D:    A20028      LDX #$2800
C3/6A30:    801C        BRA $6A4E
C3/6A32:    A20030      LDX #$3000
C3/6A35:    8017        BRA $6A4E
C3/6A37:    A20038      LDX #$3800
C3/6A3A:    8012        BRA $6A4E
C3/6A3C:    A20040      LDX #$4000
C3/6A3F:    800D        BRA $6A4E
C3/6A41:    A20048      LDX #$4800
C3/6A44:    8008        BRA $6A4E
C3/6A46:    A20050      LDX #$5000
C3/6A49:    8003        BRA $6A4E
C3/6A4B:    A20058      LDX #$5800
C3/6A4E:    C220        REP #$20      (16 bit memory/accum.)
C3/6A50:    7B          TDC
C3/6A51:    A00002      LDY #$0200
C3/6A54:    9F49387E    STA $7E3849,X
C3/6A58:    E8          INX
C3/6A59:    E8          INX
C3/6A5A:    9F49387E    STA $7E3849,X
C3/6A5E:    E8          INX
C3/6A5F:    E8          INX
C3/6A60:    88          DEY
C3/6A61:    D0F1        BNE $6A54
C3/6A63:    E220        SEP #$20      (8 bit memory/accum.)
C3/6A65:    60          RTS

I can't read well enough to tell exactly, but looks like a list being loaded. Maybe?

On another note, depending on what kinda item you wanted to block the selling of, couldn't you mimic the "is a tool" check at C3/B7E6? (This is the check to stop you from buying more than one of a tool btw). Sure you'd be limited to one type of item being blocked but would get around having to check the price at a strange location. Of course, I'm not sure just how easy a price check would be so, that might be a worse idea.

And yes, stopping it at /B708 would stop the sale, based on price, effectively for the very reason you said... but its more fun to do it the hard way, and maybe not to difficult other than finding where to stop it.

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I have to wonder, in a not directly related subject, if it would be possible to influence price based on a timer? Refering to Lockirby's day/night project. There are alread checks for who's leading the party, why would it be much different?