Are sellers allowed to change the price of an item ie: increase when you select buy it now?

Trying to buy some children's art frames and the price quoted is AU $4.95 but when you select the colour of the frame  price jumps to AU $ 35.99.  Is this allowed.?

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Are you saying that it is a multi listing with a drop down menu to select an item and a colour, and different colours are different prices?

 

(Is the $4.95 price actually for a frame, or something else ?)

 

If so, yes, eBay allow it 

 

What is the seller's feedback like and where are they registered?