You mean [$5,$10), no?

I do actually mean ($5, $10] but I can understand if you would prefer the other variation. My reasoning is that 'between' sounds to me to be non-inclusive ("between Fred and Joe" for example) while making the trade at $10 would just be pointless. The $10 in particular could be seen as ambiguous and if there was a symbol that meant "')' or ']', whatever" then I would use that instead.