I do not have an answer about other Nissan brakes that may work but here is a lead to where you can get Q45 parts, cheap in the US.
http://www.rockauto.com
This is a very large internet retailer in the US that specializes in buying up old stock so for an old car like the Q45, they can be a good source. Even better, they will ship internationally. I know the parts prices are reasonable. I will leave it to you to judge if the shipping costs are reasonable.
I recently prepared a Q45 on a budget as shown here:
post6676419.html?hilit=grassroots%20mot ... 5#p6676419
The pads that I bought were recommended here on NICO and I have been happy with them.
Pads:
Front: Beck/Arnley Axxis 0881448m $24.89 for the pair.
Rear: Beck/Arnley Axxis 0871483 $12.57 for the pair.
Rotors:
The rotors that I bought were Aimco brand at $14.29 each for front and $15.59 for rear. I just looked and they only have one of each still in stock but you can get other brands for as low as $19.29 each, front and $8.28 rear.
Furthermore, here are details to a discount code that will get you another 5% off
Discount on RockAuto Parts!
Thank you for being a RockAuto customer! To show our appreciation, we have a special discount for you.
Your discount code is:
3850343432227690
How to Use Your Discount Code
Enter the code above in the "How Did You Hear About Us?" space on the checkout page (above your payment information). Do not enter any other text in that space or the discount will not apply.
Please note: Discount only valid for orders placed online. Code must be entered before order is submitted.
The discount takes 5% off our already-low prices. There's no limit on order size or the number of orders. Use the code for your next order, and share the code with anyone you know who works on cars or trucks.
This discount code expires on January 24, 2016 so don't wait!
Thanks again for buying your auto parts at RockAuto!