This is what we've recently bought:

Beds - only needs 1, we have 4. He doesnt chew them though
Crate- brilliant as it's his own den. Look up crate training
kennel - never uses. Probably the wrong sort
food - we buy the good stuff, no additives & preservatives. $110 for a big bag. None of that Pal rubbish. Also bones, raw chicken necks etc
Bowls - 1 food bowl & 2 water bowls for inside & outside
Leads & collars - we've tried about 4 different collars and I'm about to get a different one. We have one normal lead & one extender lead
Car harness - for when he's on the back seat. Plugs into seatbelt thingy
another attachment for when he's in the back of DH's car. It's for utes.
Pet insurance - $30 a month. This is a must have for us. If we're ever faced with $10,000 bill for surgery, which can happen, it makes decisions easier
Registration - with council & microchip company
health - worming, flea treatment, vet. So far doggie has had conjunctivitis, which included trip to vet plus cream
Toys - squeaky toys, tug of war, teddies, balls, kongs. Look up environment enrichment
treats - for training/kongs
Blankets & towels.
Training - so far we've probably spent close to $1000 but doggie has issues
grooming - brush, shampoo. Will you clip coat & nails or get othes to do it?

Other indirect costs include:
Increased electricity - with it being so muddy, we've been going through a load of dog towels a day in washing machine & dryer
vacuum cleaner - our Miele was great but not cutting it with the dog hair. We upgraded to a Dyson Animal.
Fencing - doggie can jump normal height fences so we had added trellising. We also had a sleeper buried under the gate to prevent him digging out. He can still jump the gate so we need to fix that too

We're thinking of getting him one of those shell sandpit things as the backyard is his treasure chest of buried bones & treats.

We spent over $3k very quickly but that's just us

Make sure you get the pup from a reputable breeder who checks for hip dysplasia and other health issues. You may also be interested in curly coated retrievers