Self-Join To Split Cost In Different Columns By Category?

I've a table similar to the one below, with a SKU, Category and Cost, and need using a simple select command, split the cost in two columns one for each category (1,2), I used a self-join, and it works, but it doesn't show values not equal in both categories

Declare @Tmp_SKUCatValue Table(
SKU char(7)
,Cetegory Int
,Unit_cost Decimal
);
INSERT INTO @Tmp_SKUCatValue (SKU, Cetegory,Unit_cost)
Values
('sku-001',1,120)

[code].....

The result is as

SKU----------UCost_Cat1-----UCost_Cat2
sku-001------120--------------222
sku-002------126--------------228
sku-003------132--------------234
sku-004------138--------------240
sku-005------144--------------246
-----------------------------------------------------------

but missing the following lines,

SKU----------UCost_Cat1-----UCost_Cat2
sku-006------333--------------null
sku-007------null--------------444

Is ok to not show sku-008 as it is not part of category 1 or 2?