A quick search on the internet will allow you to find several stores where you can buy the parts you need. Take your time and compares the prices and quality.
denso plugs denso plugs
One can purchase Denso spark plugs in any local hardware like Ace Hardware. Alternatively, one can purchase it on some online stores like Advance Auto Parts and Amazon.
Denso IK20
As for NGK or Denso OEM spark plugs.
Bike comes with DENSO U24ESR-N but shop manual recommends either DENSO or NGK there are several spark plugs have different heat ranges: Standard : NGK SR8E Denso U24ESR-N Cold : NGK SR9E Denso U27ESR-N Hot : NGK SR7E Denso U22ESR-N I hope this helps
I use the Denso plugs in my SC400
93 LS400 takes either NGK BKR6EP11, or Denso PK20R11 spark plugs with .043 gap.
Use Denso Iridium spark plugs.
try NGK or Denso
To check the denso spark plugs compatibility with your 2006 Toyota Camry, I would suggest you refer to a garage or a Toyota dealership, in person or online. You always have the option to email them with any concern or information you have on your Camry. Your Toyota dealer is always in the know on their cars and which parts are best suited, even for older models: they remain their models.
There are many stores that sell the NGK spark plugs for cheap. However, the store that sells the cheapest NGK spark plugs would be the AdvanceAutoParts site which gives a 20% discount code.
No you should not really buy spark plugs from Japan for the simple reason of, if there is anything wrong with them they may not accept refunds or change of products you are est. sticking to your own country if you can.