The alloy flanges tend to cost around 4 times (maybe more) the cost of the steel flanges. What dictates the price is the quantity.
I put the option up of Alloy Oval Port Inlet Flange because last time this was the most common preference of inlet patterns.
At the moment there are only three people wanting Alloy Flanges and each of them wants a different type making them quite expensive. Until we get more interest I will be unable to supply you with the single alloy flange (unless you are prepared to pay the costs for a one-off).
For the T25 people I will be selling a set of flanges. Inlet flange (small triangle shaped piece), Dump Flange & Manifold Flange - this will be a three peice set.
EDIT: Another manifolding idea utilising 4AGE throttle bodies: