I have asked my WP about a Mad Hatter Tea Party. Here are some of the "options" she sent me. It can really add up, but I think there was a bride (Allisonwonderland, I believe), who had one without a lot of the "extras" and it wasn't TOO expensive (but that's relative, I guess

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White Picket Fence - $120 for 3 feet sections. I would recommend at least 4 sections 2 of each side so that you have at least and entrance gate to the party
Cheshire Cat $532
Caterpillar $ 750
Mushroom $110
Watch Clock Face $200
Large Tea Pot $700
Small Tea Pot $600
Flowers Large & Tall $278
White Wooden Folding Chairs $5.00 each to rent with a $215 delivery fee
If you want any characters like Alice or Mad Hatter himself it is $800 for 1 of them and $1200 for the 2 of them
The Mad Hatter cake is $985.00++
The floral people do anything from changing to bright colored linen $15.00per table and $3.00 for napkins tied with ribbon in colors with a fun funky centerpieces with Daisy's usually start at $85.00++ per
Here's a proposed menu from BW. I think those at GF would be similar, but you'd have to ask your planner.
Mad Hatter Menu Proposal
$45.50++pp
Fresh Salad Greens From the March Hares Garden
With Various Toppings and Dressings
The White Rabbits Mini Tea and Finger Sandwiches To Include:
Brie and Cranberry Chutney
Ham Salad
Tuna with Fresh Watercress
Egg Salad
The Mad Hatters Toasty Favorites:
Mini Burgers With All The Toppings
Mini Grilled Cheese On Toasty Bread
Mini Panini Sandwiches:
Roast Beef, Stilton and Mushroom
Turkey and Smoked Gouda
The Queen Of Hearts Treats:
Fresh Fruit Tarts
Variety of Freshly Baked Scones
Orange Marmalade and Strawberry Jam
Assorted bright multi colored Large Cupcakes
Accompanied By The Cheshire Cats Favorite Assorted Teas