hello. oscilloscope for sale here. 
Hi would you take 320?
NO that's way too low 
how abour 330?
that's just 10 bucks above your last offer. no. 
331?
um... no. tell you what. i'll let you have it for... 450 
oh... thank you max budget was 349 :(
ah fair enough. maybe look elsewhere. good luck
ok good selling it for that price