I don't mention it, let them come up with the pricing for you. For
disneyland as an example in price differences. I will book disney direct, probably, but I have been to various travel agents and picked up their disneyland brochures just to have a sticky at different prices (different travel agents (companies) have different brochures, so when I pass one, I grab brochures).
Ok, Price Differences from brochures on a 14 day Disneyland park pass.
Creative Holidays (from flight centre), Adult $327, Child $280
Infinity Holidays (from flight centre) - Doesn't have it
Harvey's Choice (from Harvey world travel) Adult $349 Child $299
Travel 2 (from Harvey world travel) Adult $360 Child $309
Then Expedia has prices that are cheaper than all of those.
Now with some of those above, their park passes may be more than another, but their accommodation at the same hotel is cheaper, so it's best to price different parts at different places because it may be cheaper to do accommodation with one person (travel agent) but passes cheaper with Expedia. Another example, for our Europe trip this last christmas, we were getting the London 7 day travel card which in London is a set price in pounds, I found it here on an Australian travel website (can't remember the name offhand) and in $AUD was cheaper than if I had bought it when I got there at a tube station calculating the exchange rate and it was cheaper by about $5 a ticket.
Anyway time to get child to school and get to work! I could chat about holiday planning all day,