This is Amazon buy together implementation for OpenCart - now supporting Shoppica2 theme.

!!!NEW!!! Module now support product quantities or you can now select more precisely what will be included in discount. You may now bundle items like one or more of item A plus two or more of item B:
1 x iPod Classic
2 x HPs
etc.
or you may have unlimited combinations between items. Like buy four iPhones and two iPods and you'll get X% discount.

!!!NEW!!! Discounts now work with products with options.

Define groups of two or three products and selling discount for them and give option for your user to buy all group at once with that discount. Full controll on displaying the discount[see documentation]

Very simple to install and configure. This module has two parts - Buy together module and Group Discount order total extension.

Group Discount extension is used to manage discount product groups while Buy together module is used to display groups.

Both module and extensions included in a box.

!!!NEW!!! Now added combo discount for whole category. Just choose a category, and you may create combo discount for all products in that category. i.e. Select Phones & PDAs and create a combo for that category with Nikon D300, then each product in the category will have automatically combo discount with Nikon.

!!!NEW!!! Added option to hide discount for product. If you have discount for Product A and Product B, then when browse one of them discount will be shown. However you may turn discount off for either A or B, thus opening it you would not see the discount. Thanks to Viktor Toshev for his idea.

WARNING: Strongly recommended v2.0 to be upgraded to v2.2

NOTE: There are no reported issues if you upgrade from v1.5 to 2.0.

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DEMO: store front http://opencart.snairl.com/index.php?route=product/product&product_id=40
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DEMO: administration http://opencart.snairl.com/admin/
Due to security reasons, admin access will be provided upon request
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SUPPORT EMAIL: please use gustav1[at]snairl[dot]com for support request.

If you are happy with this, check my Shipping Estimator module too:
http://www.opencart.com/index.php?route=extension/extension/info&extension_id=12266

Current version: v2.5 - major bug fixes, improve performance

version: v2.4.4 - add defaults to category required options

version: 2.4.3 - Bug fixes

version:2.4 - Add support for bundled products quantities

version:v2.3 - Add support of opencart 1.5.6

version:v2.2 - Fixing bug about discounts for 3 or more products

version:v2.1 - Added hide discount for product(s) in discount

version:v2.0 - Added support for products with options.

version:v1.5 - Added Shoppica2 theme support

version:v1.4 - Added category combo discount. Each product in given category now have the combo discount

version:v1.3 - Add display options in administration - now image size can be set within administration, can be choose display mode between images only or images with product names, product names can be shortened to specific length.

version:v1.2.3 - Fix Group Discount sort order when displaying in cart

version: v1.2.2 - Up to 4 products per discount. Fix bug with emailing

version: v.1.2 - multiple purchasing same combo

version: v1.1 - small bug fix, change texts, add "you save" amount to show customers how much they win from combo discount